Improved trade-off between thermoelectric performance and mechanical reliability of Mg2Si by hybridization of few-layered reduced graphene oxides. (15th March 2019)

• Record Type: Journal Article
• Authors: Kim, Gwansik; Kim, Sung Wng; Rim, Hyun Jun; Lee, Hwijong; Kim, Jeongmin; Roh, Jong Wook; Kim, Byung-Wook; Lee, Kyu Hyoung; Lee, Wooyoung
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 402
• Page End: 407
• Publication Date: 2019-03-15
• Subjects: Nanocomposite -- Thermoelectric -- Mg2Si -- Reduced graphene oxides -- Fracture toughness; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.052
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Nanocomposites can simultaneously enhance the thermoelectric and mechanical properties of thermoelectric materials. Here, we fabricated bulks of Mg1.96 Al0.04 Si0.97 Bi0.03 with monodispersed few-layered reduced graphene oxides utilizing ultrasonic-based wet chemical pulverizing-mixing and spark plasma sintering to improve unfavorable trade-off between thermoelectric performance and mechanical reliability, which is important for commercialization. An unexpected high fracture toughness of ~1.88 MPa m 1/2 was observed due to the synergetic effect of the deflection of crack propagation, bridging, and sheet pull-out mechanisms, and a high thermoelectric figure of merit ~0.6 was obtained even for a high content (3 vol.%) of reduced graphene oxides. Graphical abstract: Unlabelled Image